From Gary Wayne Bowser (aka GaryOPA): Nope, it is called the SDAT 4.0 protection system from Sony. Previously the SDAT was only 2.7.0 and easy to unpack, simple algo. SDAT is a file containing many of the shaders, sounds, and other texture data, compressed together, normally the part that gets installed on your PS3 HDD.

There been a series of people making MODS on games using this file, since the algo. on how it was packed and encrypted was published, and legit game developers are more worried about MODS then PIRACY, so after much discussion, Sony agreed to encrypt this package with later random (not #4 as a seed) keys called SDAT 4.0 which started to appear in more recent games, part of the reason for the delay in eboots, and for recent TB firmware updates.

Sadly, some games this file can be huge, the biggest I see is over 5gb like in the FIFA games, so that means in the future some patchs will be super-big as the whole SDAT file has to be included, not just the EBOOTs and SPRXs like before.

If you blame someone, blame those script kiddies on forums making mods for COD, GTA, etc. and releasing them, in the future it might get worse every file on the BD-ROM disc encrypted with newer random key contained in the firmware.